author | Tero Marttila <terom@fixme.fi> |
Fri, 18 Jul 2008 21:28:42 +0300 | |
changeset 11175 | 020c61e39c94 |
parent 10429 | 1b99254f9607 |
permissions | -rw-r--r-- |
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/* $Id$ */ |
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/** @file newgrf_generic.cpp Handling of generic feature callbacks. */ |
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#include "stdafx.h" |
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#include "openttd.h" |
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#include "variables.h" |
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#include "landscape.h" |
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#include "debug.h" |
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#include "newgrf.h" |
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#include "newgrf_callbacks.h" |
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#include "newgrf_commons.h" |
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#include "newgrf_spritegroup.h" |
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#include "newgrf_generic.h" |
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#include "tile_map.h" |
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#include <list> |
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struct GenericCallback { |
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const GRFFile *file; |
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const SpriteGroup *group; |
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GenericCallback(const GRFFile *file, const SpriteGroup *group) : |
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file(file), |
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group(group) |
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{ } |
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}; |
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typedef std::list<GenericCallback> GenericCallbackList; |
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static GenericCallbackList _gcl[GSF_END]; |
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/** |
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* Reset all generic feature callback sprite groups. |
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*/ |
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void ResetGenericCallbacks() |
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{ |
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for (uint8 feature = 0; feature < lengthof(_gcl); feature++) { |
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_gcl[feature].clear(); |
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} |
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} |
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/** |
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* Add a generic feature callback sprite group to the appropriate feature list. |
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* @param feature |
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* @param file |
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* @param group |
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*/ |
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void AddGenericCallback(uint8 feature, const GRFFile *file, const SpriteGroup *group) |
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{ |
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if (feature >= lengthof(_gcl)) { |
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grfmsg(5, "AddGenericCallback: Unsupported feature 0x%02X", feature); |
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return; |
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} |
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/* Generic feature callbacks are evaluated in reverse (i.e. the last group |
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* to be added is evaluated first, etc) thus we push the group to the |
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* beginning of the list so a standard iterator will do the right thing. */ |
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_gcl[feature].push_front(GenericCallback(file, group)); |
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} |
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static uint32 GenericCallbackGetRandomBits(const ResolverObject *object) |
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{ |
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return 0; |
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} |
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static uint32 GenericCallbackGetTriggers(const ResolverObject *object) |
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{ |
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return 0; |
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} |
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static void GenericCallbackSetTriggers(const ResolverObject *object, int triggers) |
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{ |
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return; |
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} |
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static uint32 GenericCallbackGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available) |
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{ |
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switch (variable) { |
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case 0x40: return object->u.generic.cargo_type; |
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case 0x80: return object->u.generic.cargo_type; |
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case 0x81: return object->u.generic.cargo_type; |
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case 0x82: return object->u.generic.default_selection; |
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case 0x83: return object->u.generic.src_industry; |
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case 0x84: return object->u.generic.dst_industry; |
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case 0x85: return object->u.generic.distance; |
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case 0x86: return object->u.generic.event; |
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case 0x87: return object->u.generic.count; |
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case 0x88: return object->u.generic.station_size; |
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default: break; |
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} |
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DEBUG(grf, 1, "Unhandled generic feature property 0x%02X", variable); |
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*available = false; |
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return 0; |
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} |
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static const SpriteGroup *GenericCallbackResolveReal(const ResolverObject *object, const SpriteGroup *group) |
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{ |
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if (group->g.real.num_loaded == 0) return NULL; |
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return group->g.real.loaded[0]; |
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} |
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static inline void NewGenericResolver(ResolverObject *res) |
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{ |
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res->GetRandomBits = &GenericCallbackGetRandomBits; |
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res->GetTriggers = &GenericCallbackGetTriggers; |
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res->SetTriggers = &GenericCallbackSetTriggers; |
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res->GetVariable = &GenericCallbackGetVariable; |
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res->ResolveReal = &GenericCallbackResolveReal; |
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res->callback = CBID_NO_CALLBACK; |
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res->callback_param1 = 0; |
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res->callback_param2 = 0; |
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res->last_value = 0; |
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res->trigger = 0; |
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res->reseed = 0; |
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res->count = 0; |
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} |
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/** Follow a generic feature callback list and return the first successful |
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* answer |
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* @param feature GRF Feature of callback |
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* @param object pre-populated resolver object |
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* @param file address of GRFFile object if file reference is needed, NULL is valid |
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* @return callback value if successful or CALLBACK_FAILED |
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*/ |
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static uint16 GetGenericCallbackResult(uint8 feature, ResolverObject *object, const GRFFile **file) |
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{ |
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assert(feature < lengthof(_gcl)); |
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/* Test each feature callback sprite group. */ |
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for (GenericCallbackList::const_iterator it = _gcl[feature].begin(); it != _gcl[feature].end(); ++it) { |
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const SpriteGroup *group = it->group; |
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group = Resolve(group, object); |
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if (group == NULL || group->type != SGT_CALLBACK) continue; |
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/* Return NewGRF file if necessary */ |
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if (file != NULL) *file = it->file; |
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|
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return group->g.callback.result; |
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} |
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/* No callback returned a valid result, so we've failed. */ |
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return CALLBACK_FAILED; |
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} |
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|
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/** |
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* 'Execute' an AI purchase selection callback |
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*/ |
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uint16 GetAiPurchaseCallbackResult(uint8 feature, CargoID cargo_type, uint8 default_selection, IndustryType src_industry, IndustryType dst_industry, uint8 distance, AIConstructionEvent event, uint8 count, uint8 station_size, const GRFFile **file) |
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{ |
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ResolverObject object; |
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NewGenericResolver(&object); |
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object.callback = CBID_GENERIC_AI_PURCHASE_SELECTION; |
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object.u.generic.cargo_type = cargo_type; |
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object.u.generic.default_selection = default_selection; |
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object.u.generic.src_industry = src_industry; |
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object.u.generic.dst_industry = dst_industry; |
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object.u.generic.distance = distance; |
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object.u.generic.event = event; |
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object.u.generic.count = count; |
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object.u.generic.station_size = station_size; |
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|
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uint16 callback = GetGenericCallbackResult(feature, &object, file); |
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if (callback != CALLBACK_FAILED) callback = GB(callback, 0, 8); |
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return callback; |
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} |